JavaScript 數據類型

javascript中常見的數據類型有String,Number,Boolean,初次之外還有Object,Undefined,Function,

例如以下代碼:

<script type="text/javascript">
    function testTypeOf() {
        var message = "hello";
        alert(typeof(message)); //string
        var num = 110;
        alert(typeof(num));     //number
        var boo = false;
        alert(typeof(boo));     //boolean
        var unde;
        alert(typeof(unde));    //undefined
        var fun = function(){return;};
        alert(typeof(fun));     //function
        var nul = null;
        alert(typeof(nul));     //object

        alert(typeof 9);
    }
    testTypeOf();
</script>

注意,typeof不是一個函數,而是一個操作符,因此typeof 9可以不加括號;